Per VARIETY, the film hit the $300 million mark in 10 days (fastest in history) and is expected to cross $400 million by next weekend. WB believes DARK KNIGHT has the potential to gross more than $500 million domestically, becoming the only film since TITANIC to do so. TITANIC, released in 1997, got a North American cume of $600.8M.

IMAX's record-breaking haul on DARK KNIGHT for the weekend was $4.6M. "We're in unchartered territory. These are unprecedented numbers for us, and most shows continue to be sold out. We continue to add shows," said IMAX Filmed Ent. Chairman and President Greg Foster to VARIETY.

Considering the two films were going after much the same audience, Sony's STEP BROTHERS opened a very respectable number two with $30.94M.

Third went to MAMMA MIA! (Universal, vfx by Framestore), declining about 35 percent with $17.746M and $62.595M in two weeks.

Fox's THE X-FILES: I WANT TO BELIEVE opened in fourth with $10.02M (vfx by At The Post, Entity FX, Frantic Films and Screaming Death Monkey).